Germs tend to get in through a cut, ride in on something you ate, filter through the air, or wait on a coin for you to touch it and then rub your eyes. Once inside, they start to breed and you get infection. It makes you feel sick.
When your immune system reads a tell-tale “fingerprint” of proteins on the surface of cells, the white blood cells (WBCs) aim to destroy the germs.
When your body is not able to fight infections, many health problems start.